package com.nowcoder.service;

import com.nowcoder.dao.UserMapper;
import com.nowcoder.entity.LoginTicket;
import com.nowcoder.entity.User;
import com.nowcoder.util.CommunityConstant;
import com.nowcoder.util.CommunityUtil;
import com.nowcoder.util.MailClient;
import com.nowcoder.util.RedisKeyUtil;
import com.sun.javafx.scene.control.skin.VirtualFlow;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.stereotype.Service;
import org.thymeleaf.TemplateEngine;
import org.thymeleaf.context.Context;

import java.util.*;
import java.util.concurrent.TimeUnit;

/**
 * @author by lvshh
 * @version 1.0
 * @date 2020/4/21 17:05
 */
@Service
public class UserService implements CommunityConstant {
    @Autowired
    private UserMapper userMapper;

    @Autowired
    private MailClient mailClient;

    @Autowired
    private TemplateEngine templateEngine;

    @Autowired
    private RedisTemplate redisTemplate;

//    @Autowired
//    private LoginTicketMapper loginTicketMapper;

    @Value("${community.path.domain}")
    private String domain;

    @Value("${server.servlet.context-path}")
    private String contextPath;

    public User findUserById(int id){
        //return userMapper.selectById(id);
        User user = getCache(id);
        if (user == null){
            user = initCache(id);
        }
        return user;
    }

    /**
     * 注册
     * @param user
     * @return
     */
    public Map<String,Object> register(User user){
        Map<String,Object> map = new HashMap<>();
        //空值处理
        if (user == null){
            throw new IllegalArgumentException("参数不能为空");
        }
        if (StringUtils.isBlank(user.getUsername())){
            map.put("usernameMsg","账号不能为空");
            return map;
        }

        if (StringUtils.isBlank(user.getPassword())){
            map.put("passwordMsg","密码不能为空");
            return map;
        }

        if (StringUtils.isBlank(user.getEmail())){
            map.put("emailMsg","邮箱不能为空");
            return map;
        }

        //验证用户名是否存在
        User u = userMapper.selectByName(user.getUsername());
        if (u != null){
            map.put("usernameMsg","该账号已存在");
            return map;
        }

        //验证邮箱
        u = userMapper.selectByEmail(user.getEmail());
        if (u != null){
            map.put("emailMsg","该邮箱已被注册");
            return map;
        }

        //注册用户
        user.setSalt(CommunityUtil.generateUUID().substring(0,5));
        user.setPassword(CommunityUtil.md5(user.getPassword() + user.getSalt()));
        user.setType(0);
        user.setStatus(0);
        user.setActivationCode(CommunityUtil.generateUUID());
        user.setHeaderUrl(String.format("http://images.nowcoder.com/head/%dt.png",new Random().nextInt(1000)));
        user.setCreateTime(new Date());
        userMapper.insertUser(user);

        //激活邮件
        Context context = new Context();
        context.setVariable("email",user.getEmail());
        //http://localhost:8080/community/activation/101/code
        String url = domain + contextPath + "/activation/" + user.getId() + "/" + user.getActivationCode();
        context.setVariable("url",url);

        String content = templateEngine.process("/mail/activation",context);
        mailClient.sendMail(user.getEmail(),"激活账号",content);

        return map;
    }

    /**
     * 激活
     * @param userId 用户Id
     * @param code 激活码
     * @return
     */
    public int activation(int userId,String code){
        User user = userMapper.selectById(userId);
        if (user.getStatus() == 1){
            return ACTIVATION_REPEAT;
        }else if(user.getActivationCode().equals(code)){
            userMapper.updateStatus(userId,1);
            clearCache(userId);
            return ACTIVATION_SUCCESS;
        }else {
            return ACTIVATION_FALLURE;
        }
    }

    /**
     * 登录
     * @param username
     * @param password
     * @param expiredSeconds
     * @return
     */
    public Map<String,Object> login(String username,String password,int expiredSeconds){
        Map<String,Object> map = new HashMap<>();

        //空值判断
        if (StringUtils.isBlank(username)){
            map.put("usernameMsg","账号不能为空");
        }
        if (StringUtils.isBlank(password)){
            map.put("passwordMsg","密码不能为空");
        }

        //验证账号
        User user = userMapper.selectByName(username);
        if (user == null){
            map.put("usernameMsg","该账号不存在");
            return map;
        }
        //验证状态
        if (user.getStatus() == 0){
            map.put("usernameMsg","该账号未激活");
            return map;
        }

        //验证密码
        password = CommunityUtil.md5(password + user.getSalt());
        if (!user.getPassword().equals(password)){
            map.put("passwordMsg","密码不正确");
            return map;
        }

        //生成登录凭证
        LoginTicket loginTicket = new LoginTicket();
        loginTicket.setUserId(user.getId());
        loginTicket.setTicket(CommunityUtil.generateUUID());
        loginTicket.setStatus(0);
        loginTicket.setExpired(new Date(System.currentTimeMillis() + expiredSeconds * 1000));
        //loginTicketMapper.insertLoginTicket(loginTicket);

        String redisKey = RedisKeyUtil.getTicketKey(loginTicket.getTicket());
        redisTemplate.opsForValue().set(redisKey,loginTicket);


        map.put("ticket",loginTicket.getTicket());
        return map;
    }

    /**
     * 注销
     * @param ticket
     */
    public void logout(String ticket){

       // loginTicketMapper.updateStatus(ticket,1);
        String redisKey = RedisKeyUtil.getTicketKey(ticket);
        LoginTicket loginTicket  = (LoginTicket) redisTemplate.opsForValue().get(redisKey);
        loginTicket.setStatus(1);
        redisTemplate.opsForValue().set(redisKey,loginTicket);
    }

    /**
     * 根据cookie中的ticket查询User
     * @param ticket
     * @return
     */
    public LoginTicket findLoginTicket(String ticket){
        //return loginTicketMapper.selectByTicket(ticket);
        String redisKey = RedisKeyUtil.getTicketKey(ticket);
        return (LoginTicket) redisTemplate.opsForValue().get(redisKey);
    }

    /**
     * 更新头像路径
     * @param userId
     * @param headerUrl
     * @return
     */
    public int updateHeader(int userId,String headerUrl){
//        clearCache(userId);
//        return userMapper.updateHeader(userId,headerUrl);
        int rows = userMapper.updateHeader(userId, headerUrl);
        clearCache(rows);
        return rows;

    }

    /**
     * 修改密码
     * @param userId
     * @param password
     * @return
     */
    public int updataPassword(int userId,String password){
        //return userMapper.updatePassword(userId,password);
        int rows = userMapper.updatePassword(userId, password);
        clearCache(userId);
        return rows;
    }

    public User findUserByName(String username){
        return userMapper.selectByName(username);
    }

    //1.优先从缓存中取值
    private User getCache(int userId){
        String redisKey = RedisKeyUtil.getUserKey(userId);
        return (User) redisTemplate.opsForValue().get(redisKey);
    }
    //2.取不到时初始化缓存数据
    private User initCache(int userId){
        User user = userMapper.selectById(userId);
        String redisKey = RedisKeyUtil.getUserKey(userId);
        redisTemplate.opsForValue().set(redisKey,user,3600, TimeUnit.SECONDS);
        return user;
    }
    //3.数据变更时清楚缓存数据
    private void clearCache(int userId){
        String redisKey = RedisKeyUtil.getUserKey(userId);
        redisTemplate.delete(redisKey);
    }

    public Collection<? extends GrantedAuthority> getAuthority(int userId){
        User user = findUserById(userId);
        List<GrantedAuthority> list = new ArrayList<>();
        list.add(new GrantedAuthority() {
            @Override
            public String getAuthority() {
                switch (user.getType()){
                    case 1 : return AUTHORITY_ADMIN;
                    case 2 : return AUTHORITY_MODERATOR;
                    default: return AUTHORITY_USER;
                }
            }
        });
        return list;
    }
}
